Raiders LE Lamarr Houston has changed agents to Drew Rosenhaus. Houston has two years left on his rookie deal, though he may begin angling for a raise after another big season. While the 24-year-old's sacks dipped in 2011, he was a high-impact run defender and pass rusher, the latter in terms of quarterback hurries. New Raiders coach Dennis Allen figures to use more standard 4-3 principles, so Houston may play more tackle going forward.